﻿/*******************************************************************************
 * Copyright (c) 2013 IBM Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompanies this distribution.
 *  
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Steve Pitschke  - initial API and implementation
 *******************************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Antlr.Runtime.Tree;

namespace OSLC4Net.Core.Query.Impl
{
    class SimpleSortTermImpl : SortTermImpl, SimpleSortTerm
    {
        public SimpleSortTermImpl(
            CommonTree tree,
            IDictionary<string, string> prefixMap
        ) : base(SortTermType.SIMPLE, tree, prefixMap)
        {
        }

        public bool
        Ascending
        {
            get
            {
                if (ascending == null)
                {
                    ascending = tree.GetChild(1).Text.Equals("+");
                }

                return ascending == true ? true : false;
            }
        }

        public override String
        ToString()
        {
            return Ascending + Identifier.ToString();
        }

        private bool? ascending = null;
    }
}
